People gather to play at the Pokemon Go Stadium event at Yokohama Stadium in August 2017 (Photo by Tomohiro Ohsumi/Getty Images)

Pokemon Go continues to surge in popularity and another big event has been added to the calendar for Halloween 2017.

The Pokemon Go Halloween event will be taking place later this month and while not too much has been confirmed yet, there is plenty of speculation of what we can expect.

What is the Pokemon Go Halloween event?

Pokemon Go’s Halloween event will be returning for a second year after players received plenty of fun surprises in 2016.

Last year’s Halloween event saw candy rewards double for hatching eggs between 26th October and 1st November, Buddy pokemon also awarded candy four times faster than normal.

The event also saw ‘spooky’ Pokemon appear more frequently for players including Zubat, Golbat, Gastly and Gengar.

Could we see another Mewtwo raid during Halloween? (Photo by Tomohiro Ohsumi/Getty Images)

What to expect during the Halloween event

The Pokemon of website has already promised ‘plenty of good stuff’ for later this month, and said they ‘can’t wait to get out and about to see what sort of excitement we can scare up while catching new Pokémon to fill out our Pokédex.’

Some fans speculate that Halloween could be the time when some Gen 3 Pokemon are finally made available on the app.

Fans will be hoping that Halloween offers another opportunity to catch a legendary Pokemon such as Mewtwo

The first Gen 3 releases could be Halloween themed, meaning potential appearances from ghost and dark type pokemon such as Sneasel and Umbreon.